Pressure Dependence of the Superconducting Transition Temperature of Magnesium Diboride

We studied the pressure and temperature dependence of the electrical resistivity of the superconducting compound magnesium diboride (MgB2). The superconducting transition temperature decreases monotonically with pressure, being parabolic or linear, depending on samples. The rate of decrease under pr...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 2001-04, Vol.292 (5514), p.75-77
Hauptverfasser:	Monteverde, M., Núñez-Regueiro, M., Rogado, N., Regan, K. A., Hayward, M. A., He, T., Loureiro, S. M., Cava, R. J.
Format:	Artikel
Sprache:	eng
Schlagworte:	Boron Circles Climate Condensed matter: electronic structure, electrical, magnetic, and optical properties Critical Reading Degassing of metals Electrical resistivity Exact sciences and technology Magnesium Materials Metals Metals (Materials) Metals, alloys and compounds (a15, 001c15, laves phases, chevrel phases, borocarbides, etc.) Metals alloys and binary compounds (including A15, Laves phases, etc.) Organic Chemistry Physics Pressure dependence Pressure effects Refraction Superconducting materials (excluding high-tc compounds) Superconductivity Temperature Temperature dependence Transition temperature Transition temperature variations
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Beschreibung
Zusammenfassung:	We studied the pressure and temperature dependence of the electrical resistivity of the superconducting compound magnesium diboride (MgB2). The superconducting transition temperature decreases monotonically with pressure, being parabolic or linear, depending on samples. The rate of decrease under pressure is higher than in conventional superconductors. We discuss our results in terms of the semimetallic character of the electronic band structure of (MgB2).
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.1059775